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Mask and vent assembly therefor

  • US 8,833,371 B2
  • Filed: 11/11/2010
  • Issued: 09/16/2014
  • Est. Priority Date: 02/10/1997
  • Status: Expired due to Fees
First Claim
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1. A CPAP mask assembly for use with a system for supplying breathable gas pressurized above atmospheric pressure to a human or animal, the mask assembly comprising:

  • a mask including a rigid plastics shell and an inlet tube adapted to connect to a gas supply conduit, the shell provided with a seal to contact the human or animal in use; and

    a vent assembly for gas washout of CO2-laden gas from the mask or the conduit provided to the mask while reducing noise generated by gas washout, the vent assembly including an insert attachable to the mask or conduit, the insert having at least one gas washout orifice extending from an inner side of the insert oriented, in use, towards the human or animal'"'"'s face to an outer side oriented, in use, towards the atmosphere, the gas washout orifice being open in use, whereinthe inner side of the insert includes an inner flanged end portion that is structured to extend inside the mask or conduit and the outer side of the insert includes an outer flanged end portion that is structured to extend outside the mask or conduit, andthe insert includes a plurality of said orifices,wherein a cross-sectional area of each orifice at the inner side of the insert is larger than a cross-sectional area of each orifice at the outer side of the insert, and the insert is insertable into an opening in the mask or conduit in only a single orientation which a smaller end of each orifice is positioned at the outer side of the insert.

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